strnul(3)

✨ strnul(3) ✨

okay bestie, welcome to strnul(3) — the lil function that finds the end of your string 💖

🌸 NAME 🌸

strnul — string search NUL 🎀

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📚 LIBRARY 📚

gnulib — The GNU Portability Library 🫶

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🦋 SYNOPSIS 🦋

#include <string.h>

char *strnul(char *s);
const char *strnul(const char *s);

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💅 DESCRIPTION 💅

so strnul() figures out where the terminating null byte ('\0') lives inside the string that s points at. that's it. that's the whole job 👑

it's literally equivalent to both of these expressions, no cap:

s + strlen(s)
strchr(s, '\0')

like, either one. same energy. same result. periodt ✨

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🎀 RETURN VALUE 🎀

strnul() hands you back a pointer to that terminating null byte in the string s points to. so you get a pointer to the '\0', not the string itself. she's pointing at the finish line 🏁

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🔥 ATTRIBUTES 🔥

(nvm if the terms here are confusing, attributes(7) has the whole explanation 💜)

• Interface: strnul()
  • Attribute: Thread safety
  • Value: MT-Safe ✅

MT-Safe means you can run her from multiple threads and she will Not cause drama 🫶

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⭐ STANDARDS ⭐

GNU.

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🌈 HISTORY 🌈

gnulib 202607. — yeah she's recent, she's new on the scene, and she's already iconic 💅

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👀 SEE ALSO 👀

• strlen(3)
• strchr(3)
• string(3)

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ok so tl;dr: strnul() = "where's the \0? here." and honestly? we love a function with zero chaos. go forth and find your null bytes bestie 🦋✨

shoutout to the Linux man-pages 6.20 girlies, this page was dated 2026-02-25 💖 that's the page for strnul(3), mwah, bye 🎀